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Employee Benefit Plans (Schedule of Benefits Plans) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Pension Benefit Plan [Member]        
Periodic costs for employee retirement benefit plans        
Service Cost $ 577 $ 639 $ 1,731 $ 1,918
Interest Cost 761 724 2,284 2,171
Expected Return on Assets (1,004) (980) (3,011) (2,939)
Amortization of Unrecognized Losses 357 411 1,070 1,234
Amortization of Unrecognized Prior Service Cost (Credit)
Net Periodic Benefit Cost 691 794 2,074 2,384
Other Benefits Plan [Member]        
Periodic costs for employee retirement benefit plans        
Service Cost 275 343 824 1,029
Interest Cost 488 480 1,464 1,441
Expected Return on Assets (558) (527) (1,674) (1,580)
Amortization of Unrecognized Losses 443 565 1,330 1,696
Amortization of Unrecognized Prior Service Cost (Credit) (432) (432) (1,296) (1,296)
Net Periodic Benefit Cost $ 216 $ 429 $ 648 $ 1,290